IB Chemistry SL 1.3.3 Main Energy Levels

Practise interpreting the principal quantum number as a label for a main electron energy level. Apply the 2n² relationship to determine a shell's maximum capacity and distinguish…

Syllabus
First assessment 2025
Objective
1.3.3
Level
SL

Exam points

  • use 2n² to calculate the maximum number of electrons in a stated main energy level
  • distinguish a shell's theoretical capacity from the electrons present in a given atom

1.3.3—Main energy levels question 1

[Maximum number: 1]

What is the maximum number of electrons that can occupy the n=3 main energy level?

A

3

B

8

C

18

D

28

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